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    14．He traveled in the space for twenty-one and a half hours．

    分析 他在太空旅行了二十一个半小时．

    解答 答案：去掉space之前的the
    本句中的space指的是太空，故它的前面不加任何冠词．

    点评 做本题时，需要掌握名词space的用法；当space意为"太空"时，其前不加冠词；当space意为"场所、空地、时间"等，指"在某一场所或在某一时间内"时，它的前面可以加冠词；如：in the short space of human life 在短暂的人生中．

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